<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表格属性</title>
</head>
<body>
    属性需要卸载table标签内<br>
    align:对齐方式<br>
    border:边框<br>
    cellpadding:单元格边沿内容之间的空白默认1px<br>
    cellspacing:单元格之间的空白，默认2px<br>
    width:表格的宽度
    height:高度

    <table align="center" border="1" cellpadding="20" cellspacing="0" width=500 height=250>
        <tr>
            <th>姓名</th><th>性别</th><th>年龄</th>
        </tr>
        <tr>
            <td>签内容会加粗</td><td>签内容会加粗</td><td>签内容会加粗</td>
        </tr>
        <tr>
            <td>1</td><td>2</td><td>3</td>
        </tr>
        <tr>
            <td>1</td><td>2</td><td>3</td>
        </tr>
    </table>

</body>
</html>